[LU-15707] Unable to create file without a pool with a pool define on the parent or on the fs root.

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.4
• Environment: 2.12.8 LTS/ 2.15
• Severity: 3
• Assignee: Etienne Aujames
• Reporter: Etienne Aujames

Description

The user need to have a way to force file creation without a pool to select specific OSTs (lfs setstripe --ost) or to use all the OST for the stripe's selections.
The patch https://review.whamcloud.com/41815 remove the pool from the layout when a ostlist is supplied (lfs setstripe --ost) , but this behavior will be changed with LU-15658.

Reproducer:

# lfs setstripe -p ost0 testdir/
# lfs setstripe -p ''  testdir/testfile              
# lfs setstripe -p none  testdir/testfile2           
# lfs setstripe -c2  testdir/testfile3
# lfs getstripe -p testdir/* 
ost0                                             
                                                 
ost0                                             
                                                 
ost0                                             

On 2.12.8:

# lfs setstripe -p ost0 testdir/
# lfs setstripe --ost 1,0  testdir/testfile1              
lfs setstripe: setstripe error for 'testdir/testfile1': Invalid argument
# lfs setstripe --ost 0,1  testdir/testfile2  
# lfs getstripe -p testdir/testfile2
ost0            
                                 

EINVAL is returned because MDT only check if the first OST index is in the pool (see the LU-14480).

Issue Links

• is related to: LU-15658 Interop sanity-flr test_0b test_0c test_0e test_0f: verify pool failed != flash
• is related to: LU-14480 Setting specific OST's under pool failed with error message "invalid argument"
• is related to: LUDOC-511 Add documentation for special/reserved pool name "ignore", "none and "inherit"